Understand Normal, Jump, or Spike

The volume delta, if positive, is added to the Indicated Volume (IV).

Note: Although the IV acts as a counter, a rollover is not observed, because it is almost impossible for the counter to reach its physical limit with a 64-bit architecture.

The following diagram shows how jumps are handled. The Raw Counter (rate counter) has deltas from 4 to 16 and 20 to 36 that are determined unreasonable. After each of these unreasonable deltas, a reasonable delta is established using the previous rate counter. The Volume Result (IV counter) is calculated based on this information.

The following diagram illustrates an example of multiple spikes.

A negative reasonable delta is a rare case. However, it can occur if the physical meter can measure a reverse flow. The handling of this depends on the configuration of the Volume Accumulation Mode on the Advanced Database Editor (ADE):

• Positive Only. The IV will not decrease. The total volume decrease is tracked internally over multiple cycles with negative and positive deltas added to it. Once this internal value reaches zero, any further positive deltas are added to the IV. The following example shows the IV change over time where instances of negative flow have occurred in two separate time intervals.

  

• Positive and Negative. The negative delta is added to the IV. The following example shows the IV change over time for this mode where volume deltas are the same as the previous example.